New: Show previously installed version in Updates UI

Co-Authored-By: Taloth <Taloth@users.noreply.github.com>

src/NzbDrone.Core/Datastore/Converters/SystemVersionConverter.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Data;
+using Dapper;
+
+namespace NzbDrone.Core.Datastore.Converters
+{
+    public class SystemVersionConverter : SqlMapper.TypeHandler<Version>
+    {
+        public override Version Parse(object value)
+        {
+            if (value is string version)
+            {
+                return Version.Parse((string)value);
+            }
+
+            return null;
+        }
+
+        public override void SetValue(IDbDataParameter parameter, Version value)
+        {
+            parameter.Value = value.ToString();
+        }
+    }
+}